A start, stop, restart service
Start the httpd service:
systemctl start httpd.service
Stop the httpd service:
systemctl stop httpd.service
Restart the httpd service:
systemctl restart httpd.service
Restart the httpd service in the running state:
systemctl condrestart httpd.service
Reload the httpd service configuration file: systemctl reload httpd.service
Second, view, prohibit, and start the service
Start the httpd service at boot:
systemctl enable httpd.service
Disable httpd service at boot:
systemctl disable httpd.service
View httpd service status:
systemctl status
httpd.service
Comparison of three systemd commands and sysvinit commands
| sysvinit command | systemd command | Remark |
| service httpd start | systemctl start httpd.service | start httpd service |
| service httpd stop | systemctl stop httpd.service | close httpd service |
| service httpd restart | systemctl restart httpd.service | Restart the httpd service, regardless of the current state of the httpd service |
| service httpd reload | systemctl reload httpd.service | Reload httpd configuration information without interrupting service |
| service httpd condrestart | systemctl condrestart httpd.service | Restart the httpd service. If it is already running, restart the httpd service. If it is not running, the service cannot be started. |
| service httpd status | systemctl status httpd.service | View the running status of the httpd service |
| chkconfig httpd on | systemctl enable httpd.service | Set the httpd service to start automatically at boot |
| chkconfig httpd off | systemctl disable httpd.service | Prevent httpd service from automatically starting at boot |
| chkconfig httpd | systemctl is-enable httpd.service | Check if the httpd service is enabled or disabled in the current environment |
| chkconfig --list | systemctl list-unit-files --type=service | Output whether all services are enabled or disabled at each run level |
| chkconfig httpd --list | ls /etc/systemd/system/*.wants/httpd.service | View the enabling and disabling of the httpd service at each run level |
Four systemd power management commands
| systemctl command | meaning |
| systemctl poweroff | shut down the system |
| systemctl reboot | reboot the system |
| systemctl suspend | enter standby mode |
| systemctl hibernate | enter sleep mode |
| systemctl hybrid-sleep | Enter Hybrid Sleep Mode |